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Date: Fri, 22 May 2009 16:06:41 +0900
From: Akira Fujita <a-fujita@...jp.nec.com>
To: Theodore Tso <tytso@....edu>, linux-ext4@...r.kernel.org
CC: linux-fsdevel@...r.kernel.org
Subject: [RFC][PATCH 2/3] Ext4 online defrag command
ext4: online defrag -- Ext4 online defrag command
From: Akira Fujita <a-fujita@...jp.nec.com>
- Usage is as follows:
- Defrag for a single file.
# e4defrag file, device, directory
- Check the file fragments on ext4.
# e4defrag -c device, directory
Signed-off-by: Akira Fujita <a-fujita@...jp.nec.com>
Signed-off-by: Takashi Sato <t-sato@...jp.nec.com>
---
/*
* e4defrag.c - ext4 filesystem defragmenter
*
* Copyright (C) 2009 NEC Software Tohoku, Ltd.
*
* Author: Akira Fujita <a-fujita@...jp.nec.com>
* Takashi Sato <t-sato@...jp.nec.com>
*/
#ifndef _LARGEFILE_SOURCE
#define _LARGEFILE_SOURCE
#endif
#ifndef _LARGEFILE64_SOURCE
#define _LARGEFILE64_SOURCE
#endif
#define _XOPEN_SOURCE 500
#define _GNU_SOURCE
#include <ctype.h>
#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <ftw.h>
#include <limits.h>
#include <mntent.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ext2fs/ext2_types.h>
#include <ext2fs/ext2fs.h>
#include <linux/fs.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/statfs.h>
#include <sys/syscall.h>
#include <sys/vfs.h>
/* Ioctl command */
#define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
/* Macro functions */
#define PRINT_ERR_MSG(msg) fprintf(stderr, "%s\n", (msg))
#define IN_FTW_PRINT_ERR_MSG(msg) \
fprintf(stderr, "\t%s\t\t[ NG ]\n", (msg))
#define PRINT_FILE_NAME(file) fprintf(stderr, " \"%s\"\n", (file))
#define PRINT_ERR_MSG_WITH_ERRNO(msg) \
fprintf(stderr, "\t%s:%s\t[ NG ]\n", (msg), strerror(errno))
#define STATISTIC_ERR_MSG(msg) \
fprintf(stderr, "\t%s\n", (msg))
#define STATISTIC_ERR_MSG_WITH_ERRNO(msg) \
fprintf(stderr, "\t%s:%s\n", (msg), strerror(errno))
#define min(x, y) (((x) > (y)) ? (y) : (x))
#define SECTOR_TO_BLOCK(sectors, blocksize) \
((sectors) / ((blocksize) >> 9))
#define CALC_SCORE(ratio) \
((ratio) > 10 ? (80 + 20 * (ratio) / 100) : (8 * (ratio)))
/* Wrap up the free function */
#define FREE(tmp) \
do { \
if ((tmp) != NULL) \
free(tmp); \
} while (0) \
/* Insert list2 after list1 */
#define insert(list1, list2) \
do { \
list2->next = list1->next; \
list1->next->prev = list2; \
list2->prev = list1; \
list1->next = list2; \
} while (0)
/* To delete unused warning */
#ifdef __GNUC__
#define EXT2FS_ATTR(x) __attribute__(x)
#else
#define EXT2FS_ATTR(x)
#endif
#ifndef __NR_fadvise64
#define __NR_fadvise64 250
#endif
#ifndef __NR_sync_file_range
#define __NR_sync_file_range 314
#endif
#ifndef __NR_fallocate
#define __NR_fallocate 324
#endif
#ifndef POSIX_FADV_DONTNEED
#if defined(__s390x__)
#define POSIX_FADV_DONTNEED 6 /* Don't need these pages */
#else
#define POSIX_FADV_DONTNEED 4 /* Don't need these pages */
#endif
#endif
#ifndef SYNC_FILE_RANGE_WAIT_BEFORE
#define SYNC_FILE_RANGE_WAIT_BEFORE 1
#endif
#ifndef SYNC_FILE_RANGE_WRITE
#define SYNC_FILE_RANGE_WRITE 2
#endif
#ifndef SYNC_FILE_RANGE_WAIT_AFTER
#define SYNC_FILE_RANGE_WAIT_AFTER 4
#endif
/* The mode of defrag */
#define DETAIL 0x01
#define STATISTIC 0x02
#define DEVNAME 0
#define DIRNAME 1
#define FILENAME 2
#define FTW_OPEN_FD 2000
#define FS_EXT4 "ext4"
#define ROOT_UID 0
#define BOUND_SCORE 55
#define SHOW_FRAG_FILES 5
/* Magic number for ext4 */
#define EXT4_SUPER_MAGIC 0xEF53
/* Definition of flex_bg */
#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
/* The following four macros are used for ioctl FS_IOC_FIEMAP
* FIEMAP_FLAG_SYNC: sync file data before map.
* FIEMAP_EXTENT_LAST: last extent in file.
* FIEMAP_MAX_OFFSET: max file offset.
* EXTENT_MAX_COUNT: the maximum number of extents for exchanging between
* kernel-space and user-space per ioctl
*/
#define FIEMAP_FLAG_SYNC 0x00000001
#define FIEMAP_EXTENT_LAST 0x00000001
#define FIEMAP_EXTENT_UNWRITTEN 0x00000800
#define FIEMAP_MAX_OFFSET (~0ULL)
#define EXTENT_MAX_COUNT 512
/* The following macros are error message */
#define MSG_USAGE \
"Usage : e4defrag [-v] file...| directory...| device...\n\
: e4defrag -c file...| directory...| device...\n"
#define NGMSG_EXT4 "Filesystem is not ext4 filesystem"
#define NGMSG_FILE_EXTENT "Failed to get file extents"
#define NGMSG_FILE_INFO "Failed to get file information"
#define NGMSG_FILE_OPEN "Failed to open"
#define NGMSG_FILE_UNREG "File is not regular file"
#define NGMSG_LOST_FOUND "Can not process \"lost+found\""
/* Data type for filesystem-wide blocks number */
typedef unsigned long long ext4_fsblk_t;
struct fiemap_extent_data {
__u64 len; /* blocks count */
__u64 logical; /* start logical block number */
ext4_fsblk_t physical; /* start physical block number */
};
struct fiemap_extent_list {
struct fiemap_extent_list *prev;
struct fiemap_extent_list *next;
struct fiemap_extent_data data; /* extent belong to file */
};
struct fiemap_extent_group {
struct fiemap_extent_group *prev;
struct fiemap_extent_group *next;
__u64 len; /* length of this continuous region */
struct fiemap_extent_list *start; /* start ext */
struct fiemap_extent_list *end; /* end ext */
};
struct move_extent {
int orig_fd; /* original file descriptor */
int donor_fd; /* donor file descriptor */
__u64 orig_start; /* logical start offset in block for orig */
__u64 donor_start; /* logical start offset in block for donor */
__u64 len; /* block length to be moved */
__u64 moved_len; /* moved block length */
};
struct fiemap_extent {
__u64 fe_logical; /* logical offset in bytes for the start of
* the extent from the beginning of the file */
__u64 fe_physical; /* physical offset in bytes for the start
* of the extent from the beginning
* of the disk */
__u64 fe_length; /* length in bytes for this extent */
__u64 fe_reserved64[2];
__u32 fe_flags; /* FIEMAP_EXTENT_* flags for this extent */
__u32 fe_reserved[3];
};
struct fiemap {
__u64 fm_start; /* logical offset (inclusive) at
* which to start mapping (in) */
__u64 fm_length; /* logical length of mapping which
* userspace wants (in) */
__u32 fm_flags; /* FIEMAP_FLAG_* flags for request (in/out) */
__u32 fm_mapped_extents;/* number of extents that were mapped (out) */
__u32 fm_extent_count; /* size of fm_extents array (in) */
__u32 fm_reserved;
struct fiemap_extent fm_extents[0];/* array of mapped extents (out) */
};
struct frag_statistic_ino {
int now_count; /* the file's extents count of before defrag */
int best_count; /* the best file's extents count */
float ratio; /* the ratio of fragmentation */
char msg_buffer[PATH_MAX + 1]; /* pathname of the file */
};
typedef __u16 __le16;
typedef __u32 __le32;
typedef __u64 __le64;
/*
* Structure of the super block
*/
struct ext4_super_block {
/*00*/ __le32 s_inodes_count; /* Inodes count */
__le32 s_blocks_count_lo; /* Blocks count */
__le32 s_r_blocks_count_lo; /* Reserved blocks count */
__le32 s_free_blocks_count_lo; /* Free blocks count */
/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
__le32 s_first_data_block; /* First Data Block */
__le32 s_log_block_size; /* Block size */
__le32 s_obso_log_frag_size; /* Obsoleted fragment size */
/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
__le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
__le32 s_inodes_per_group; /* # Inodes per group */
__le32 s_mtime; /* Mount time */
/*30*/ __le32 s_wtime; /* Write time */
__le16 s_mnt_count; /* Mount count */
__le16 s_max_mnt_count; /* Maximal mount count */
__le16 s_magic; /* Magic signature */
__le16 s_state; /* File system state */
__le16 s_errors; /* Behaviour when detecting errors */
__le16 s_minor_rev_level; /* minor revision level */
/*40*/ __le32 s_lastcheck; /* time of last check */
__le32 s_checkinterval; /* max. time between checks */
__le32 s_creator_os; /* OS */
__le32 s_rev_level; /* Revision level */
/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
__le16 s_def_resgid; /* Default gid for reserved blocks */
/*
* These fields are for EXT4_DYNAMIC_REV superblocks only.
*
* Note: the difference between the compatible feature set and
* the incompatible feature set is that if there is a bit set
* in the incompatible feature set that the kernel doesn't
* know about, it should refuse to mount the filesystem.
*
* e2fsck's requirements are more strict; if it doesn't know
* about a feature in either the compatible or incompatible
* feature set, it must abort and not try to meddle with
* things it doesn't understand...
*/
__le32 s_first_ino; /* First non-reserved inode */
__le16 s_inode_size; /* size of inode structure */
__le16 s_block_group_nr; /* block group # of this superblock */
__le32 s_feature_compat; /* compatible feature set */
/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
__le32 s_feature_ro_compat; /* readonly-compatible feature set */
/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
/*78*/ char s_volume_name[16]; /* volume name */
/*88*/ char s_last_mounted[64]; /* directory where last mounted */
/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
/*
* Performance hints. Directory preallocation should only
* happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
*/
__u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
__u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
__le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
/*
* Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
*/
/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
__le32 s_journal_dev; /* device number of journal file */
__le32 s_last_orphan; /* start of list of inodes to delete */
__le32 s_hash_seed[4]; /* HTREE hash seed */
__u8 s_def_hash_version; /* Default hash version to use */
__u8 s_reserved_char_pad;
__le16 s_desc_size; /* size of group descriptor */
/*100*/ __le32 s_default_mount_opts;
__le32 s_first_meta_bg; /* First metablock block group */
__le32 s_mkfs_time; /* When the filesystem was created */
__le32 s_jnl_blocks[17]; /* Backup of the journal inode */
/* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
__le32 s_r_blocks_count_hi; /* Reserved blocks count */
__le32 s_free_blocks_count_hi; /* Free blocks count */
__le16 s_min_extra_isize; /* All inodes have at least # bytes */
__le16 s_want_extra_isize; /* New inodes should reserve # bytes */
__le32 s_flags; /* Miscellaneous flags */
__le16 s_raid_stride; /* RAID stride */
__le16 s_mmp_interval; /* # seconds to wait in MMP checking */
__le64 s_mmp_block; /* Block for multi-mount protection */
__le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
__u8 s_log_groups_per_flex; /* FLEX_BG group size */
__u8 s_reserved_char_pad2;
__le16 s_reserved_pad;
__u32 s_reserved[162]; /* Padding to the end of the block */
};
char lost_found_dir[PATH_MAX + 1];
int block_size;
int extents_before_defrag;
int extents_after_defrag;
int mode_flag;
unsigned int current_uid;
unsigned int defraged_file_count;
unsigned int frag_files_before_defrag;
unsigned int frag_files_after_defrag;
unsigned int regular_count;
unsigned int succeed_cnt;
unsigned int total_count;
__u8 log_groups_per_flex;
__le32 blocks_per_group;
__le32 feature_incompat;
ext4_fsblk_t files_block_count;
struct frag_statistic_ino frag_rank[SHOW_FRAG_FILES];
/*
* ext2fs_swab32() - Change endian.
*
* @val: the entry used for change.
*/
__u32 ext2fs_swab32(__u32 val)
{
#if BYTE_ORDER == BIG_ENDIAN
return (val >> 24) | ((val >> 8) & 0xFF00) |
((val << 8) & 0xFF0000) | (val << 24);
#else
return val;
#endif
}
/*
* fadvise() - Give advice about file access.
*
* @fd: defrag target file's descriptor.
* @offset: file offset.
* @len: area length.
* @advise: process flag.
*/
int fadvise(int fd, loff_t offset, size_t len, int advise)
{
return syscall(__NR_fadvise64, fd, offset, len, advise);
}
/*
* sync_file_range() - Sync file region.
*
* @fd: defrag target file's descriptor.
* @offset: file offset.
* @length: area length.
* @flag: process flag.
*/
int sync_file_range(int fd, loff_t offset, loff_t length, unsigned int flag)
{
return syscall(__NR_sync_file_range, fd, offset, length, flag);
}
/*
* fallocate() - Manipulate file space.
*
* @fd: defrag target file's descriptor.
* @mode: process flag.
* @offset: file offset.
* @len: file size.
*/
int fallocate(int fd, int mode, loff_t offset, loff_t len)
{
return syscall(__NR_fallocate, fd, mode, offset, len);
}
/*
* get_mount_point() - Get device's mount point.
*
* @devname: the device's name.
* @mount_point: the mount point.
* @dir_path_len: the length of directory.
*/
int get_mount_point(const char *devname, char *mount_point, int dir_path_len)
{
/* Refer to /etc/mtab */
char *mtab = MOUNTED;
FILE *fp = NULL;
struct mntent *mnt = NULL;
fp = setmntent(mtab, "r");
if (fp == NULL) {
perror("Couldn't access /etc/mtab");
return -1;
}
while ((mnt = getmntent(fp)) != NULL) {
if (strcmp(devname, mnt->mnt_fsname) != 0)
continue;
endmntent(fp);
if (strcmp(mnt->mnt_type, FS_EXT4) == 0) {
strncpy(mount_point, mnt->mnt_dir,
dir_path_len);
return 0;
}
PRINT_ERR_MSG(NGMSG_EXT4);
return -1;
}
endmntent(fp);
PRINT_ERR_MSG("Filesystem is not mounted");
return -1;
}
/*
* is_ext4() - Whether on an ext4 filesystem.
*
* @file: the file's name.
*/
int is_ext4(const char *file)
{
int maxlen = 0;
int len, ret;
FILE *fp = NULL;
char *mnt_type = NULL;
/* Refer to /etc/mtab */
char *mtab = MOUNTED;
char file_path[PATH_MAX + 1];
struct mntent *mnt = NULL;
struct statfs64 fsbuf;
/* Get full path */
if (realpath(file, file_path) == NULL) {
perror("Couldn't get full path");
PRINT_FILE_NAME(file);
return -1;
}
if (statfs64(file_path, &fsbuf) < 0) {
perror("Failed to get filesystem information");
PRINT_FILE_NAME(file);
return -1;
}
if (fsbuf.f_type != EXT4_SUPER_MAGIC) {
PRINT_ERR_MSG(NGMSG_EXT4);
return -1;
}
fp = setmntent(mtab, "r");
if (fp == NULL) {
perror("Couldn't access /etc/mtab");
return -1;
}
while ((mnt = getmntent(fp)) != NULL) {
len = strlen(mnt->mnt_dir);
ret = memcmp(file_path, mnt->mnt_dir, len);
if (ret != 0)
continue;
if (maxlen >= len)
continue;
maxlen = len;
mnt_type = realloc(mnt_type, strlen(mnt->mnt_type) + 1);
if (mnt_type == NULL) {
endmntent(fp);
return -1;
}
memset(mnt_type, 0, strlen(mnt->mnt_type) + 1);
strncpy(mnt_type, mnt->mnt_type, strlen(mnt->mnt_type));
strncpy(lost_found_dir, mnt->mnt_dir, PATH_MAX);
}
endmntent(fp);
if (strcmp(mnt_type, FS_EXT4) == 0) {
FREE(mnt_type);
return 0;
} else {
FREE(mnt_type);
PRINT_ERR_MSG(NGMSG_EXT4);
return -1;
}
}
/*
* calc_entry_counts() - Calculate file counts.
*
* @file: file name.
* @buf: file info.
* @flag: file type.
* @ftwbuf: the pointer of a struct FTW.
*/
int calc_entry_counts(const char *file EXT2FS_ATTR((unused)),
const struct stat64 *buf, int flag EXT2FS_ATTR((unused)),
struct FTW *ftwbuf EXT2FS_ATTR((unused)))
{
if (S_ISREG(buf->st_mode))
regular_count++;
total_count++;
return 0;
}
/*
* page_in_core() - Get information on whether pages are in core.
*
* @fd: defrag target file's descriptor.
* @defrag_data: data used for defrag.
* @vec: page state array.
* @page_num: page number.
*/
int page_in_core(int fd, struct move_extent defrag_data,
unsigned char **vec, unsigned int *page_num)
{
long pagesize = sysconf(_SC_PAGESIZE);
void *page = NULL;
loff_t offset, end_offset, length;
if (vec == NULL || *vec != NULL)
return -1;
/* In mmap, offset should be a multiple of the page size */
offset = (loff_t)defrag_data.orig_start * block_size;
length = (loff_t)defrag_data.len * block_size;
end_offset = offset + length;
/* Round the offset down to the nearest multiple of pagesize */
offset = (offset / pagesize) * pagesize;
length = end_offset - offset;
page = mmap(NULL, length, PROT_READ, MAP_SHARED, fd, offset);
if (page == MAP_FAILED)
return -1;
*page_num = 0;
*page_num = (length + pagesize - 1) / pagesize;
*vec = (unsigned char *)calloc(*page_num, 1);
if (*vec == NULL)
return -1;
/* Get information on whether pages are in core */
if (mincore(page, (size_t)length, *vec) == -1 ||
munmap(page, length) == -1) {
FREE(*vec);
return -1;
}
return 0;
}
/*
* defrag_fadvise() - Predeclare an access pattern for file data.
*
* @fd: defrag target file's descriptor.
* @defrag_data: data used for defrag.
* @vec: page state array.
* @page_num: page number.
*/
int defrag_fadvise(int fd, struct move_extent defrag_data,
unsigned char *vec, unsigned int page_num)
{
int flag = 1;
long pagesize = sysconf(_SC_PAGESIZE);
int fadvise_flag = POSIX_FADV_DONTNEED;
int sync_flag = SYNC_FILE_RANGE_WAIT_BEFORE |
SYNC_FILE_RANGE_WRITE |
SYNC_FILE_RANGE_WAIT_AFTER;
unsigned int i;
loff_t offset;
offset = (loff_t)defrag_data.orig_start * block_size;
offset = (offset / pagesize) * pagesize;
/* Sync file for fadvise process */
if (sync_file_range(fd, offset,
(loff_t)pagesize * page_num, sync_flag) < 0)
return -1;
/* Try to release buffer cache which this process used,
* then other process can use the released buffer
*/
for (i = 0; i < page_num; i++) {
if ((vec[i] & 0x1) == 0) {
offset += pagesize;
continue;
}
if (fadvise(fd, offset, pagesize, fadvise_flag) < 0) {
if ((mode_flag & DETAIL) && flag) {
perror("\tFailed to fadvise");
flag = 0;
}
}
offset += pagesize;
}
return 0;
}
/*
* check_free_size() - Check if there's enough disk space.
*
* @fd: defrag target file's descriptor.
* @file: file name.
* @buf: the pointer of the struct stat64.
*/
int check_free_size(int fd, const char *file, const struct stat64 *buf)
{
ext4_fsblk_t blk_count;
ext4_fsblk_t free_blk_count;
struct statfs64 fsbuf;
if (fstatfs64(fd, &fsbuf) < 0) {
if (mode_flag & DETAIL) {
PRINT_FILE_NAME(file);
PRINT_ERR_MSG_WITH_ERRNO(
"Failed to get filesystem information");
}
return -1;
}
/* Target file size measured by filesystem IO blocksize */
blk_count = SECTOR_TO_BLOCK(buf->st_blocks, fsbuf.f_bsize);
/* Compute free space for root and normal user separately */
if (current_uid == ROOT_UID)
free_blk_count = fsbuf.f_bfree;
else
free_blk_count = fsbuf.f_bavail;
if (free_blk_count >= blk_count)
return 0;
return -ENOSPC;
}
/*
* file_frag_count() - Get file fragment count.
*
* @fd: defrag target file's descriptor.
*/
int file_frag_count(int fd)
{
int ret;
struct fiemap fiemap_buf;
/* When fm_extent_count is 0,
* ioctl just get file fragment count.
*/
memset(&fiemap_buf, 0, sizeof(struct fiemap));
fiemap_buf.fm_start = 0;
fiemap_buf.fm_length = FIEMAP_MAX_OFFSET;
fiemap_buf.fm_flags |= FIEMAP_FLAG_SYNC;
ret = ioctl(fd, FS_IOC_FIEMAP, &fiemap_buf);
if (ret < 0)
return ret;
return fiemap_buf.fm_mapped_extents;
}
/*
* file_check() - Check file's attributes.
*
* @fd: defrag target file's descriptor.
* @buf: a pointer of the struct stat64.
* @file: the file's name.
* @extents: the file's extents.
*/
int file_check(int fd, const struct stat64 *buf, const char *file,
int extents)
{
int ret;
struct flock lock;
/* Write-lock check is more reliable */
lock.l_type = F_WRLCK;
lock.l_start = 0;
lock.l_whence = SEEK_SET;
lock.l_len = 0;
/* Free space */
ret = check_free_size(fd, file, buf);
if (ret < 0) {
if ((mode_flag & DETAIL) && ret == -ENOSPC) {
printf("\033[79;0H\033[K[%u/%u] \"%s\"\t\t"
" extents: %d -> %d\n", defraged_file_count,
total_count, file, extents, extents);
IN_FTW_PRINT_ERR_MSG(
"Defrag size is larger than filesystem's free space");
}
return -1;
}
/* Access authority */
if (current_uid != ROOT_UID &&
buf->st_uid != current_uid) {
if (mode_flag & DETAIL) {
printf("\033[79;0H\033[K[%u/%u] \"%s\"\t\t"
" extents: %d -> %d\n", defraged_file_count,
total_count, file, extents, extents);
IN_FTW_PRINT_ERR_MSG(
"File is not current user's file"
" or current user is not root");
}
return -1;
}
/* Lock status */
if (fcntl(fd, F_GETLK, &lock) < 0) {
if (mode_flag & DETAIL) {
PRINT_FILE_NAME(file);
PRINT_ERR_MSG_WITH_ERRNO(
"Failed to get lock information");
}
return -1;
} else if (lock.l_type != F_UNLCK) {
if (mode_flag & DETAIL) {
PRINT_FILE_NAME(file);
IN_FTW_PRINT_ERR_MSG("File has been locked");
}
return -1;
}
return 0;
}
/*
* insert_extent_by_logical() - Sequentially insert extent by logical.
*
* @ext_list_head: the head of logical extent list.
* @ext: the extent element which will be inserted.
*/
int insert_extent_by_logical(struct fiemap_extent_list **ext_list_head,
struct fiemap_extent_list *ext)
{
struct fiemap_extent_list *ext_list_tmp = *ext_list_head;
if (ext == NULL)
goto out;
/* First element */
if (*ext_list_head == NULL) {
(*ext_list_head) = ext;
(*ext_list_head)->prev = *ext_list_head;
(*ext_list_head)->next = *ext_list_head;
return 0;
}
if (ext->data.logical <= ext_list_tmp->data.logical) {
/* Insert before head */
if (ext_list_tmp->data.logical <
ext->data.logical + ext->data.len)
/* Overlap */
goto out;
/* Adjust head */
*ext_list_head = ext;
} else {
/* Insert into the middle or last of the list */
do {
if (ext->data.logical < ext_list_tmp->data.logical)
break;
ext_list_tmp = ext_list_tmp->next;
} while (ext_list_tmp != (*ext_list_head));
if (ext->data.logical <
ext_list_tmp->prev->data.logical +
ext_list_tmp->prev->data.len)
/* Overlap */
goto out;
if (ext_list_tmp != *ext_list_head &&
ext_list_tmp->data.logical <
ext->data.logical + ext->data.len)
/* Overlap */
goto out;
}
ext_list_tmp = ext_list_tmp->prev;
/* Insert "ext" after "ext_list_tmp" */
insert(ext_list_tmp, ext);
return 0;
out:
errno = EINVAL;
return -1;
}
/*
* insert_extent_by_physical() - Sequentially insert extent by physical.
*
* @ext_list_head: the head of physical extent list.
* @ext: the extent element which will be inserted.
*/
int insert_extent_by_physical(struct fiemap_extent_list **ext_list_head,
struct fiemap_extent_list *ext)
{
struct fiemap_extent_list *ext_list_tmp = *ext_list_head;
if (ext == NULL)
goto out;
/* First element */
if (*ext_list_head == NULL) {
(*ext_list_head) = ext;
(*ext_list_head)->prev = *ext_list_head;
(*ext_list_head)->next = *ext_list_head;
return 0;
}
if (ext->data.physical <= ext_list_tmp->data.physical) {
/* Insert before head */
if (ext_list_tmp->data.physical <
ext->data.physical + ext->data.len)
/* Overlap */
goto out;
/* Adjust head */
*ext_list_head = ext;
} else {
/* Insert into the middle or last of the list */
do {
if (ext->data.physical < ext_list_tmp->data.physical)
break;
ext_list_tmp = ext_list_tmp->next;
} while (ext_list_tmp != (*ext_list_head));
if (ext->data.physical <
ext_list_tmp->prev->data.physical +
ext_list_tmp->prev->data.len)
/* Overlap */
goto out;
if (ext_list_tmp != *ext_list_head &&
ext_list_tmp->data.physical <
ext->data.physical + ext->data.len)
/* Overlap */
goto out;
}
ext_list_tmp = ext_list_tmp->prev;
/* Insert "ext" after "ext_list_tmp" */
insert(ext_list_tmp, ext);
return 0;
out:
errno = EINVAL;
return -1;
}
/*
* insert_exts_group() - Insert a exts_group.
*
* @ext_group_head: the head of a exts_group list.
* @exts_group: the exts_group element which will be inserted.
*/
int insert_exts_group(struct fiemap_extent_group **ext_group_head,
struct fiemap_extent_group *exts_group)
{
struct fiemap_extent_group *ext_group_tmp = NULL;
if (exts_group == NULL) {
errno = EINVAL;
return -1;
}
/* Initialize list */
if (*ext_group_head == NULL) {
(*ext_group_head) = exts_group;
(*ext_group_head)->prev = *ext_group_head;
(*ext_group_head)->next = *ext_group_head;
return 0;
}
ext_group_tmp = (*ext_group_head)->prev;
insert(ext_group_tmp, exts_group);
return 0;
}
/*
* join_extents() - Find continuous region(exts_group).
*
* @ext_list_head: the head of the extent list.
* @ext_group_head: the head of the target exts_group list.
*/
int join_extents(struct fiemap_extent_list *ext_list_head,
struct fiemap_extent_group **ext_group_head)
{
__u64 len = ext_list_head->data.len;
struct fiemap_extent_list *ext_list_start = ext_list_head;
struct fiemap_extent_list *ext_list_tmp = ext_list_head->next;
do {
struct fiemap_extent_group *ext_group_tmp = NULL;
/* This extent and previous extent are not continuous,
* so, all previous extents are treated as an extent group.
*/
if ((ext_list_tmp->prev->data.logical +
ext_list_tmp->prev->data.len)
!= ext_list_tmp->data.logical) {
ext_group_tmp =
malloc(sizeof(struct fiemap_extent_group));
if (ext_group_tmp == NULL)
return -1;
memset(ext_group_tmp, 0,
sizeof(struct fiemap_extent_group));
ext_group_tmp->len = len;
ext_group_tmp->start = ext_list_start;
ext_group_tmp->end = ext_list_tmp->prev;
if (insert_exts_group(ext_group_head,
ext_group_tmp) < 0) {
FREE(ext_group_tmp);
return -1;
}
ext_list_start = ext_list_tmp;
len = ext_list_tmp->data.len;
ext_list_tmp = ext_list_tmp->next;
continue;
}
/* This extent and previous extent are continuous,
* so, they belong to the same extent group, and we check
* if the next extent belongs to the same extent group.
*/
len += ext_list_tmp->data.len;
ext_list_tmp = ext_list_tmp->next;
} while (ext_list_tmp != ext_list_head->next);
return 0;
}
/*
* get_file_extents() - Get file's extent list.
*
* @fd: defrag target file's descriptor.
* @ext_list_head: the head of the extent list.
*/
int get_file_extents(int fd, struct fiemap_extent_list **ext_list_head)
{
__u32 i;
int ret;
int ext_buf_size, fie_buf_size;
__u64 pos = 0;
struct fiemap *fiemap_buf = NULL;
struct fiemap_extent *ext_buf = NULL;
struct fiemap_extent_list *ext_list = NULL;
/* Convert units, in bytes.
* Be careful : now, physical block number in extent is 48bit,
* and the maximum blocksize for ext4 is 4K(12bit),
* so there is no overflow, but in future it may be changed.
*/
/* Alloc space for fiemap */
ext_buf_size = EXTENT_MAX_COUNT * sizeof(struct fiemap_extent);
fie_buf_size = sizeof(struct fiemap) + ext_buf_size;
fiemap_buf = malloc(fie_buf_size);
if (fiemap_buf == NULL)
return -1;
ext_buf = fiemap_buf->fm_extents;
memset(fiemap_buf, 0, fie_buf_size);
fiemap_buf->fm_length = FIEMAP_MAX_OFFSET;
fiemap_buf->fm_flags |= FIEMAP_FLAG_SYNC;
fiemap_buf->fm_extent_count = EXTENT_MAX_COUNT;
do {
fiemap_buf->fm_start = pos;
memset(ext_buf, 0, ext_buf_size);
ret = ioctl(fd, FS_IOC_FIEMAP, fiemap_buf);
if (ret < 0)
goto out;
for (i = 0; i < fiemap_buf->fm_mapped_extents; i++) {
ext_list = NULL;
ext_list = malloc(sizeof(struct fiemap_extent_list));
if (ext_list == NULL)
goto out;
ext_list->data.physical = ext_buf[i].fe_physical
/ block_size;
ext_list->data.logical = ext_buf[i].fe_logical
/ block_size;
ext_list->data.len = ext_buf[i].fe_length
/ block_size;
ret = insert_extent_by_physical(
ext_list_head, ext_list);
if (ret < 0) {
FREE(ext_list);
goto out;
}
}
/* Record file's logical offset this time */
pos = ext_buf[EXTENT_MAX_COUNT-1].fe_logical +
ext_buf[EXTENT_MAX_COUNT-1].fe_length;
/*
* If fm_extents array has been filled and
* there are extents left, continue to cycle.
*/
} while (fiemap_buf->fm_mapped_extents
== EXTENT_MAX_COUNT &&
!(ext_buf[EXTENT_MAX_COUNT-1].fe_flags
& FIEMAP_EXTENT_LAST));
FREE(fiemap_buf);
return 0;
out:
FREE(fiemap_buf);
return -1;
}
/*
* get_logical_count() - Get the file logical extents count.
*
* @logical_list_head: the head of the logical extent list.
*/
int get_logical_count(struct fiemap_extent_list *logical_list_head)
{
int ret = 0;
struct fiemap_extent_list *ext_list_tmp = logical_list_head;
do {
ret++;
ext_list_tmp = ext_list_tmp->next;
} while (ext_list_tmp != logical_list_head);
return ret;
}
/*
* get_physical_count() - Get the file physical extents count.
*
* @physical_list_head: the head of the physical extent list.
*/
int get_physical_count(struct fiemap_extent_list *physical_list_head)
{
int ret = 0;
struct fiemap_extent_list *ext_list_tmp = physical_list_head;
do {
if ((ext_list_tmp->data.physical + ext_list_tmp->data.len)
!= ext_list_tmp->next->data.physical) {
/* This extent and next extent are not continuous. */
ret++;
}
ext_list_tmp = ext_list_tmp->next;
} while (ext_list_tmp != physical_list_head);
return ret;
}
/*
* change_physical_to_logical() - Change list from physical to logical.
*
* @physical_list_head: the head of physical extent list.
* @logical_list_head: the head of logical extent list.
*/
int change_physical_to_logical(struct fiemap_extent_list **physical_list_head,
struct fiemap_extent_list **logical_list_head)
{
int ret;
struct fiemap_extent_list *ext_list_tmp = *physical_list_head;
struct fiemap_extent_list *ext_list_next = ext_list_tmp->next;
while (1) {
if (ext_list_tmp == ext_list_next) {
ret = insert_extent_by_logical(
logical_list_head, ext_list_tmp);
if (ret < 0)
return -1;
*physical_list_head = NULL;
break;
}
ext_list_tmp->prev->next = ext_list_tmp->next;
ext_list_tmp->next->prev = ext_list_tmp->prev;
*physical_list_head = ext_list_next;
ret = insert_extent_by_logical(
logical_list_head, ext_list_tmp);
if (ret < 0) {
FREE(ext_list_tmp);
return -1;
}
ext_list_tmp = ext_list_next;
ext_list_next = ext_list_next->next;
}
return 0;
}
/*
* free_ext() - Free the extent list.
*
* @ext_list_head: the extent list head of which will be free.
*/
void free_ext(struct fiemap_extent_list *ext_list_head)
{
struct fiemap_extent_list *ext_list_tmp = NULL;
if (ext_list_head == NULL)
return;
while (ext_list_head->next != ext_list_head) {
ext_list_tmp = ext_list_head;
ext_list_head->prev->next = ext_list_head->next;
ext_list_head->next->prev = ext_list_head->prev;
ext_list_head = ext_list_head->next;
free(ext_list_tmp);
}
free(ext_list_head);
}
/*
* free_exts_group() - Free the exts_group.
*
* @*ext_group_head: the exts_group list head which will be free.
*/
void free_exts_group(struct fiemap_extent_group *ext_group_head)
{
struct fiemap_extent_group *ext_group_tmp = NULL;
if (ext_group_head == NULL)
return;
while (ext_group_head->next != ext_group_head) {
ext_group_tmp = ext_group_head;
ext_group_head->prev->next = ext_group_head->next;
ext_group_head->next->prev = ext_group_head->prev;
ext_group_head = ext_group_head->next;
free(ext_group_tmp);
}
free(ext_group_head);
}
/*
* get_superblock_info() - Get superblock info by the file name.
*
* @file: the file's name.
* @sb: the pointer of the struct ext4_super_block.
*/
int get_superblock_info(const char *file, struct ext4_super_block *sb)
{
/* Refer to /etc/mtab */
char *mtab = MOUNTED;
FILE *fp = NULL;
int fd = -1;
int ret;
size_t maxlen = 0;
size_t len;
char dev_name[PATH_MAX + 1];
struct mntent *mnt = NULL;
fp = setmntent(mtab, "r");
if (fp == NULL)
return -1;
while ((mnt = getmntent(fp)) != NULL) {
len = strlen(mnt->mnt_dir);
ret = memcmp(file, mnt->mnt_dir, len);
if (ret != 0)
continue;
if (len < maxlen)
continue;
maxlen = len;
memset(dev_name, 0, PATH_MAX + 1);
strncpy(dev_name, mnt->mnt_fsname,
strnlen(mnt->mnt_fsname, PATH_MAX));
}
fd = open64(dev_name, O_RDONLY);
if (fd < 0) {
ret = -1;
goto out;
}
/* Set offset to read superblock */
ret = lseek64(fd, SUPERBLOCK_OFFSET, SEEK_SET);
if (ret < 0)
goto out;
ret = read(fd, sb, sizeof(struct ext4_super_block));
if (ret < 0)
goto out;
out:
if (fd != -1)
close(fd);
endmntent(fp);
return ret;
}
/*
* get_best_count() - Get the file best extents count.
*
* @block_count: the file's physical block count.
*/
int get_best_count(ext4_fsblk_t block_count)
{
int ret;
unsigned int flex_bg_num;
/* Calcuate best extents count */
if (feature_incompat & EXT4_FEATURE_INCOMPAT_FLEX_BG) {
flex_bg_num = 1 << log_groups_per_flex;
ret = ((block_count - 1) /
((ext4_fsblk_t)blocks_per_group *
flex_bg_num)) + 1;
} else
ret = ((block_count - 1) / blocks_per_group) + 1;
return ret;
}
/*
* file_statistic() - Get statistic info of the file's fragments.
*
* @file: the file's name.
* @buf: the pointer of the struct stat64.
* @flag: file type.
* @ftwbuf: the pointer of a struct FTW.
*/
int file_statistic(const char *file, const struct stat64 *buf,
int flag EXT2FS_ATTR((unused)),
struct FTW *ftwbuf EXT2FS_ATTR((unused)))
{
int fd;
int ret;
int now_ext_count, best_ext_count, physical_ext_count;
int i, j;
float ratio = 0.0;
ext4_fsblk_t blk_count = 0;
char msg_buffer[PATH_MAX + 24];
struct fiemap_extent_list *physical_list_head = NULL;
struct fiemap_extent_list *logical_list_head = NULL;
defraged_file_count++;
if (mode_flag & DETAIL) {
if (total_count == 1 && regular_count == 1)
printf("<File>\n");
else {
printf("[%u/%u]", defraged_file_count, total_count);
fflush(stdout);
}
}
if (lost_found_dir[0] != '\0' &&
!memcmp(file, lost_found_dir, strnlen(lost_found_dir, PATH_MAX))) {
if (mode_flag & DETAIL) {
PRINT_FILE_NAME(file);
STATISTIC_ERR_MSG(NGMSG_LOST_FOUND);
}
return 0;
}
if (!S_ISREG(buf->st_mode)) {
if (mode_flag & DETAIL) {
PRINT_FILE_NAME(file);
STATISTIC_ERR_MSG(NGMSG_FILE_UNREG);
}
return 0;
}
/* Access authority */
if (current_uid != ROOT_UID &&
buf->st_uid != current_uid) {
if (mode_flag & DETAIL) {
PRINT_FILE_NAME(file);
STATISTIC_ERR_MSG(
"File is not current user's file"
" or current user is not root");
}
return 0;
}
/* Empty file */
if (buf->st_size == 0) {
if (mode_flag & DETAIL) {
PRINT_FILE_NAME(file);
STATISTIC_ERR_MSG("File size is 0");
}
return 0;
}
fd = open64(file, O_RDONLY);
if (fd < 0) {
if (mode_flag & DETAIL) {
PRINT_FILE_NAME(file);
STATISTIC_ERR_MSG_WITH_ERRNO(NGMSG_FILE_OPEN);
}
return 0;
}
/* Get file's physical extents */
ret = get_file_extents(fd, &physical_list_head);
if (ret < 0) {
if (mode_flag & DETAIL) {
PRINT_FILE_NAME(file);
STATISTIC_ERR_MSG_WITH_ERRNO(NGMSG_FILE_EXTENT);
}
goto out;
}
/* Get the count of file's continuous physical region */
physical_ext_count = get_physical_count(physical_list_head);
/* Change list from physical to logical */
ret = change_physical_to_logical(&physical_list_head,
&logical_list_head);
if (ret < 0) {
if (mode_flag & DETAIL) {
PRINT_FILE_NAME(file);
STATISTIC_ERR_MSG_WITH_ERRNO(NGMSG_FILE_EXTENT);
}
goto out;
}
/* Count file fragments before defrag */
now_ext_count = get_logical_count(logical_list_head);
if (current_uid == ROOT_UID) {
/* Calculate fragment ratio */
blk_count =
SECTOR_TO_BLOCK(buf->st_blocks, block_size);
best_ext_count = get_best_count(blk_count);
ratio = (float)(physical_ext_count - best_ext_count) * 100 /
blk_count;
extents_before_defrag += now_ext_count;
extents_after_defrag += best_ext_count;
files_block_count += blk_count;
}
if (total_count == 1 && regular_count == 1) {
/* File only */
if (mode_flag & DETAIL) {
int count = 0;
struct fiemap_extent_list *ext_list_tmp =
logical_list_head;
/* Print extents info */
do {
count++;
printf("[ext %d]:\tstart %llu:\tlogical "
"%llu:\tlen %llu\n", count,
ext_list_tmp->data.physical,
ext_list_tmp->data.logical,
ext_list_tmp->data.len);
ext_list_tmp = ext_list_tmp->next;
} while (ext_list_tmp != logical_list_head);
} else {
printf("%-40s%10s/%-10s%9s\n",
"<File>", "now", "best", "ratio");
if (current_uid == ROOT_UID) {
if (strlen(file) > 40)
printf("%s\n%50d/%-10d%8.2f%%\n",
file, now_ext_count,
best_ext_count, ratio);
else
printf("%-40s%10d/%-10d%8.2f%%\n",
file, now_ext_count,
best_ext_count, ratio);
} else {
if (strlen(file) > 40)
printf("%s\n%50d/%-10s%7s\n",
file, now_ext_count,
"-", "-");
else
printf("%-40s%10d/%-10s%7s\n",
file, now_ext_count,
"-", "-");
}
}
succeed_cnt++;
goto out;
}
if (mode_flag & DETAIL) {
/* Print statistic info */
sprintf(msg_buffer, "[%u/%u]%s",
defraged_file_count, total_count, file);
if (current_uid == ROOT_UID) {
if (strlen(msg_buffer) > 40)
printf("\033[79;0H\033[K%s\n"
"%50d/%-10d%8.2f%%\n",
msg_buffer, now_ext_count,
best_ext_count, ratio);
else
printf("\033[79;0H\033[K%-40s"
"%10d/%-10d%8.2f%%\n",
msg_buffer, now_ext_count,
best_ext_count, ratio);
} else {
if (strlen(msg_buffer) > 40)
printf("\033[79;0H\033[K%s\n%50d/%-10s%7s\n",
msg_buffer, now_ext_count,
"-", "-");
else
printf("\033[79;0H\033[K%-40s%10d/%-10s%7s\n",
msg_buffer, now_ext_count,
"-", "-");
}
}
for (i = 0; i < SHOW_FRAG_FILES; i++) {
if (ratio >= frag_rank[i].ratio) {
for (j = SHOW_FRAG_FILES - 1; j > i; j--) {
memcpy(&frag_rank[j], &frag_rank[j - 1],
sizeof(struct frag_statistic_ino));
}
memset(&frag_rank[i], 0,
sizeof(struct frag_statistic_ino));
strncpy(frag_rank[i].msg_buffer, file,
strnlen(file, PATH_MAX));
frag_rank[i].now_count = now_ext_count;
frag_rank[i].best_count = best_ext_count;
frag_rank[i].ratio = ratio;
break;
}
}
succeed_cnt++;
out:
close(fd);
free_ext(physical_list_head);
free_ext(logical_list_head);
return 0;
}
/*
* print_progress - Print defrag progress
*
* @file: file name.
* @start: logical offset for defrag target file
* @file_size: defrag target filesize
*/
void print_progress(const char *file, loff_t start, loff_t file_size)
{
int percent = (start * 100) / file_size;
printf("\033[79;0H\033[K[%u/%u]%s:\t%3d%%",
defraged_file_count, total_count, file, min(percent, 100));
fflush(stdout);
return;
}
/*
* call_defrag() - Execute the defrag program.
*
* @fd: target file descriptor.
* @donor_fd: donor file descriptor.
* @file: target file name.
* @buf: pointer of the struct stat64.
* @ext_list_head: head of the extent list.
*/
int call_defrag(int fd, int donor_fd, const char *file,
const struct stat64 *buf, struct fiemap_extent_list *ext_list_head)
{
loff_t start = 0;
unsigned int page_num;
unsigned char *vec = NULL;
int defraged_ret = 0;
int ret;
struct move_extent move_data;
struct fiemap_extent_list *ext_list_tmp = NULL;
memset(&move_data, 0, sizeof(struct move_extent));
move_data.orig_fd = fd;
move_data.donor_fd = donor_fd;
/* Print defrag progress */
print_progress(file, start, buf->st_size);
ext_list_tmp = ext_list_head;
do {
move_data.orig_start = ext_list_tmp->data.logical;
/* Logical offset of orig and donor should be same */
move_data.donor_start = move_data.orig_start;
move_data.len = ext_list_tmp->data.len;
move_data.moved_len = 0;
ret = page_in_core(fd, move_data, &vec, &page_num);
if (ret < 0) {
if (mode_flag & DETAIL) {
printf("\n");
PRINT_ERR_MSG_WITH_ERRNO(
"Failed to get file map");
} else {
printf("\t[ NG ]\n");
}
return -1;
}
/* EXT4_IOC_MOVE_EXT */
defraged_ret =
ioctl(fd, EXT4_IOC_MOVE_EXT, &move_data);
/* Free pages */
ret = defrag_fadvise(fd, move_data, vec, page_num);
if (vec) {
free(vec);
vec = NULL;
}
if (ret < 0) {
if (mode_flag & DETAIL) {
printf("\n");
PRINT_ERR_MSG_WITH_ERRNO(
"Failed to free page");
} else {
printf("\t[ NG ]\n");
}
return -1;
}
if (defraged_ret < 0) {
if (mode_flag & DETAIL) {
printf("\n");
PRINT_ERR_MSG_WITH_ERRNO(
"Failed to defrag");
} else {
printf("\t[ NG ]\n");
}
return -1;
}
/* Adjust logical offset for next ioctl */
move_data.orig_start += move_data.moved_len;
move_data.donor_start = move_data.orig_start;
start = move_data.orig_start * buf->st_blksize;
/* Print defrag progress */
print_progress(file, start, buf->st_size);
/* End of file */
if (start >= buf->st_size)
break;
ext_list_tmp = ext_list_tmp->next;
} while (ext_list_tmp != ext_list_head);
return 0;
}
/*
* file_defrag() - Check file attributes and call ioctl to defrag.
*
* @file: the file's name.
* @buf: the pointer of the struct stat64.
* @flag: file type.
* @ftwbuf: the pointer of a struct FTW.
*/
int file_defrag(const char *file, const struct stat64 *buf,
int flag EXT2FS_ATTR((unused)),
struct FTW *ftwbuf EXT2FS_ATTR((unused)))
{
int fd;
int donor_fd = -1;
int ret;
int best;
int file_frags_start, file_frags_end;
int orig_physical_cnt, donor_physical_cnt;
char tmp_inode_name[PATH_MAX + 8];
struct fiemap_extent_list *orig_list_physical = NULL;
struct fiemap_extent_list *orig_list_logical = NULL;
struct fiemap_extent_list *donor_list_physical = NULL;
struct fiemap_extent_list *donor_list_logical = NULL;
struct fiemap_extent_group *orig_group_head = NULL;
struct fiemap_extent_group *orig_group_tmp = NULL;
defraged_file_count++;
if (mode_flag & DETAIL) {
printf("[%u/%u]", defraged_file_count, total_count);
fflush(stdout);
}
if (lost_found_dir[0] != '\0' &&
!memcmp(file, lost_found_dir, strnlen(lost_found_dir, PATH_MAX))) {
if (mode_flag & DETAIL) {
PRINT_FILE_NAME(file);
IN_FTW_PRINT_ERR_MSG(NGMSG_LOST_FOUND);
}
return 0;
}
if (!S_ISREG(buf->st_mode)) {
if (mode_flag & DETAIL) {
PRINT_FILE_NAME(file);
IN_FTW_PRINT_ERR_MSG(NGMSG_FILE_UNREG);
}
return 0;
}
/* Empty file */
if (buf->st_size == 0) {
if (mode_flag & DETAIL) {
PRINT_FILE_NAME(file);
IN_FTW_PRINT_ERR_MSG("File size is 0");
}
return 0;
}
fd = open64(file, O_RDONLY);
if (fd < 0) {
if (mode_flag & DETAIL) {
PRINT_FILE_NAME(file);
PRINT_ERR_MSG_WITH_ERRNO(NGMSG_FILE_OPEN);
}
return 0;
}
/* Get file's extents */
ret = get_file_extents(fd, &orig_list_physical);
if (ret < 0) {
if (mode_flag & DETAIL) {
PRINT_FILE_NAME(file);
PRINT_ERR_MSG_WITH_ERRNO(NGMSG_FILE_EXTENT);
}
goto out;
}
/* Get the count of file's continuous physical region */
orig_physical_cnt = get_physical_count(orig_list_physical);
/* Change list from physical to logical */
ret = change_physical_to_logical(&orig_list_physical,
&orig_list_logical);
if (ret < 0) {
if (mode_flag & DETAIL) {
PRINT_FILE_NAME(file);
PRINT_ERR_MSG_WITH_ERRNO(NGMSG_FILE_EXTENT);
}
goto out;
}
/* Count file fragments before defrag */
file_frags_start = get_logical_count(orig_list_logical);
if (file_check(fd, buf, file, file_frags_start) < 0)
goto out;
if (fsync(fd) < 0) {
if (mode_flag & DETAIL) {
PRINT_FILE_NAME(file);
PRINT_ERR_MSG_WITH_ERRNO("Failed to sync(fsync)");
}
goto out;
}
if (current_uid == ROOT_UID)
best =
get_best_count(SECTOR_TO_BLOCK(buf->st_blocks, block_size));
else
best = 1;
if (file_frags_start <= best)
goto check_improvement;
/* Combine extents to group */
ret = join_extents(orig_list_logical, &orig_group_head);
if (ret < 0) {
if (mode_flag & DETAIL) {
PRINT_FILE_NAME(file);
PRINT_ERR_MSG_WITH_ERRNO(NGMSG_FILE_EXTENT);
}
goto out;
}
/* Create donor inode */
memset(tmp_inode_name, 0, PATH_MAX + 8);
sprintf(tmp_inode_name, "%.*s.defrag", strnlen(file, PATH_MAX), file);
donor_fd = open64(tmp_inode_name, O_WRONLY | O_CREAT | O_EXCL, S_IRUSR);
if (donor_fd < 0) {
if (mode_flag & DETAIL) {
PRINT_FILE_NAME(file);
if (errno == EEXIST)
PRINT_ERR_MSG_WITH_ERRNO(
"File is being defraged by other program");
else
PRINT_ERR_MSG_WITH_ERRNO(NGMSG_FILE_OPEN);
}
goto out;
}
/* Unlink donor inode */
ret = unlink(tmp_inode_name);
if (ret < 0) {
if (mode_flag & DETAIL) {
PRINT_FILE_NAME(file);
PRINT_ERR_MSG_WITH_ERRNO("Failed to unlink");
}
goto out;
}
/* Allocate space for donor inode */
orig_group_tmp = orig_group_head;
do {
ret = fallocate(donor_fd, 0,
(loff_t)orig_group_tmp->start->data.logical * block_size,
(loff_t)orig_group_tmp->len * block_size);
if (ret < 0) {
if (mode_flag & DETAIL) {
PRINT_FILE_NAME(file);
PRINT_ERR_MSG_WITH_ERRNO("Failed to fallocate");
}
goto out;
}
orig_group_tmp = orig_group_tmp->next;
} while (orig_group_tmp != orig_group_head);
/* Get donor inode's extents */
ret = get_file_extents(donor_fd, &donor_list_physical);
if (ret < 0) {
if (mode_flag & DETAIL) {
PRINT_FILE_NAME(file);
PRINT_ERR_MSG_WITH_ERRNO(NGMSG_FILE_EXTENT);
}
goto out;
}
/* Calcuate donor inode's continuous physical region */
donor_physical_cnt = get_physical_count(donor_list_physical);
/* Change donor extent list from physical to logical */
ret = change_physical_to_logical(&donor_list_physical,
&donor_list_logical);
if (ret < 0) {
if (mode_flag & DETAIL) {
PRINT_FILE_NAME(file);
PRINT_ERR_MSG_WITH_ERRNO(NGMSG_FILE_EXTENT);
}
goto out;
}
check_improvement:
if (mode_flag & DETAIL) {
if (file_frags_start != 1)
frag_files_before_defrag++;
extents_before_defrag += file_frags_start;
}
if (file_frags_start <= best ||
orig_physical_cnt <= donor_physical_cnt) {
printf("\033[79;0H\033[K[%u/%u]%s:\t%3d%%",
defraged_file_count, total_count, file, 100);
if (mode_flag & DETAIL)
printf(" extents: %d -> %d",
file_frags_start, file_frags_start);
printf("\t[ OK ]\n");
succeed_cnt++;
if (file_frags_start != 1)
frag_files_after_defrag++;
extents_after_defrag += file_frags_start;
goto out;
}
/* Defrag the file */
ret = call_defrag(fd, donor_fd, file, buf, donor_list_logical);
/* Count file fragments after defrag and print extents info */
if (mode_flag & DETAIL) {
file_frags_end = file_frag_count(fd);
if (file_frags_end < 0) {
printf("\n");
PRINT_ERR_MSG_WITH_ERRNO(NGMSG_FILE_INFO);
goto out;
}
if (file_frags_end != 1)
frag_files_after_defrag++;
extents_after_defrag += file_frags_end;
if (ret < 0)
goto out;
printf(" extents: %d -> %d",
file_frags_start, file_frags_end);
fflush(stdout);
}
if (ret < 0)
goto out;
printf("\t[ OK ]\n");
fflush(stdout);
succeed_cnt++;
out:
close(fd);
if (donor_fd != -1)
close(donor_fd);
free_ext(orig_list_physical);
free_ext(orig_list_logical);
free_ext(donor_list_physical);
free_exts_group(orig_group_head);
return 0;
}
/*
* main() - Ext4 online defrag.
*
* @argc: the number of parameter.
* @argv[]: the pointer array of parameter.
*/
int main(int argc, char *argv[])
{
int opt;
int i, j;
int flags = FTW_PHYS | FTW_MOUNT;
int arg_type = -1;
int success_flag = 0;
char dir_name[PATH_MAX + 1];
struct stat64 buf;
struct ext4_super_block sb;
/* Parse arguments */
if (argc == 1)
goto out;
while ((opt = getopt(argc, argv, "vc")) != EOF) {
switch (opt) {
case 'v':
mode_flag |= DETAIL;
break;
case 'c':
mode_flag |= STATISTIC;
break;
default:
goto out;
}
}
if (argc == optind)
goto out;
current_uid = getuid();
/* Main process */
for (i = optind; i < argc; i++) {
succeed_cnt = 0;
regular_count = 0;
total_count = 0;
frag_files_before_defrag = 0;
frag_files_after_defrag = 0;
extents_before_defrag = 0;
extents_after_defrag = 0;
defraged_file_count = 0;
files_block_count = 0;
blocks_per_group = 0;
feature_incompat = 0;
log_groups_per_flex = 0;
memset(dir_name, 0, PATH_MAX + 1);
memset(lost_found_dir, 0, PATH_MAX + 1);
memset(frag_rank, 0,
sizeof(struct frag_statistic_ino) * SHOW_FRAG_FILES);
if ((mode_flag & STATISTIC) && i > optind)
printf("\n");
#if BYTE_ORDER != BIG_ENDIAN && BYTE_ORDER != LITTLE_ENDIAN
PRINT_ERR_MSG("Endian's type is not big/little endian");
PRINT_FILE_NAME(argv[i]);
continue;
#endif
if (lstat64(argv[i], &buf) < 0) {
perror(NGMSG_FILE_INFO);
PRINT_FILE_NAME(argv[i]);
continue;
}
if (S_ISBLK(buf.st_mode)) {
/* Block device */
if (get_mount_point(argv[i], dir_name, PATH_MAX) < 0)
continue;
if (lstat64(dir_name, &buf) < 0) {
perror(NGMSG_FILE_INFO);
PRINT_FILE_NAME(argv[i]);
continue;
}
arg_type = DEVNAME;
if (!(mode_flag & STATISTIC))
printf("ext4 defragmentation for device(%s)\n",
argv[i]);
} else if (S_ISDIR(buf.st_mode)) {
/* Directory */
if (access(argv[i], R_OK) < 0) {
perror(argv[i]);
continue;
}
arg_type = DIRNAME;
strncpy(dir_name, argv[i], strnlen(argv[i], PATH_MAX));
} else if (S_ISREG(buf.st_mode)) {
/* Regular file */
arg_type = FILENAME;
} else {
/* Irregular file */
PRINT_ERR_MSG(NGMSG_FILE_UNREG);
PRINT_FILE_NAME(argv[i]);
continue;
}
/* Set blocksize */
block_size = buf.st_blksize;
/* For device case,
* filesystem type checked in get_mount_point()
*/
if (arg_type == FILENAME || arg_type == DIRNAME) {
if (is_ext4(argv[i]) < 0)
continue;
if (realpath(argv[i], dir_name) == NULL) {
perror("Couldn't get full path");
PRINT_FILE_NAME(argv[i]);
continue;
}
}
if (current_uid == ROOT_UID) {
/* Get super block info */
memset(&sb, 0, sizeof(struct ext4_super_block));
if (get_superblock_info(dir_name, &sb) < 0) {
if (mode_flag & DETAIL) {
perror("Can't get super block info");
PRINT_FILE_NAME(argv[i]);
}
continue;
}
blocks_per_group = ext2fs_swab32(sb.s_blocks_per_group);
feature_incompat = ext2fs_swab32(sb.s_feature_incompat);
log_groups_per_flex = sb.s_log_groups_per_flex;
}
switch (arg_type) {
case DIRNAME:
if (!(mode_flag & STATISTIC))
printf("ext4 defragmentation "
"for directory(%s)\n", argv[i]);
int mount_dir_len = 0;
mount_dir_len = strnlen(lost_found_dir, PATH_MAX);
strncat(lost_found_dir, "/lost+found",
PATH_MAX - strnlen(lost_found_dir, PATH_MAX));
/* Not the case("e4defrag mount_piont_dir") */
if (dir_name[mount_dir_len] != '\0') {
/*
* "e4defrag mount_piont_dir/lost+found"
* or "e4defrag mount_piont_dir/lost+found/"
*/
if (strncmp(lost_found_dir, dir_name,
strnlen(lost_found_dir,
PATH_MAX)) == 0 &&
(dir_name[strnlen(lost_found_dir,
PATH_MAX)] == '\0' ||
dir_name[strnlen(lost_found_dir,
PATH_MAX)] == '/')) {
PRINT_ERR_MSG(NGMSG_LOST_FOUND);
PRINT_FILE_NAME(argv[i]);
continue;
}
/* "e4defrag mount_piont_dir/else_dir" */
memset(lost_found_dir, 0, PATH_MAX + 1);
}
case DEVNAME:
if (arg_type == DEVNAME) {
strncpy(lost_found_dir, dir_name,
strnlen(dir_name, PATH_MAX));
strncat(lost_found_dir, "/lost+found/",
PATH_MAX - strnlen(lost_found_dir,
PATH_MAX));
}
nftw64(dir_name, calc_entry_counts, FTW_OPEN_FD, flags);
if (mode_flag & STATISTIC) {
if (mode_flag & DETAIL)
printf("%-40s%10s/%-10s%9s\n",
"<File>", "now", "best", "ratio");
if (!(mode_flag & DETAIL) &&
current_uid != ROOT_UID) {
printf(" Done.\n");
continue;
}
nftw64(dir_name, file_statistic,
FTW_OPEN_FD, flags);
if (succeed_cnt != 0 &&
current_uid == ROOT_UID) {
if (mode_flag & DETAIL)
printf("\n");
printf("%-40s%10s/%-10s%9s\n",
"<Fragmented files>", "now",
"best", "ratio");
for (j = 0; j < SHOW_FRAG_FILES; j++) {
if (strlen(frag_rank[j].
msg_buffer) > 37) {
printf("%d. %s\n%50d/"
"%-10d%8.2f%%\n", j + 1,
frag_rank[j].msg_buffer,
frag_rank[j].now_count,
frag_rank[j].best_count,
frag_rank[j].ratio);
} else if (strlen(frag_rank[j].
msg_buffer) > 0) {
printf("%d. %-37s%10d/"
"%-10d%8.2f%%\n", j + 1,
frag_rank[j].msg_buffer,
frag_rank[j].now_count,
frag_rank[j].best_count,
frag_rank[j].ratio);
} else
break;
}
}
break;
}
/* File tree walk */
nftw64(dir_name, file_defrag, FTW_OPEN_FD, flags);
printf("\n\tSuccess:\t\t\t[ %u/%u ]\n", succeed_cnt,
total_count);
printf("\tFailure:\t\t\t[ %u/%u ]\n",
total_count - succeed_cnt, total_count);
if (mode_flag & DETAIL) {
printf("\tTotal extents:\t\t\t%4d->%d\n",
extents_before_defrag,
extents_after_defrag);
printf("\tFragmented percentage:\t\t"
"%3llu%%->%llu%%\n",
!regular_count ? 0 :
((unsigned long long)
frag_files_before_defrag * 100) /
regular_count,
!regular_count ? 0 :
((unsigned long long)
frag_files_after_defrag * 100) /
regular_count);
}
break;
case FILENAME:
total_count = 1;
regular_count = 1;
strncat(lost_found_dir, "/lost+found/",
PATH_MAX - strnlen(lost_found_dir,
PATH_MAX));
if (strncmp(lost_found_dir, dir_name,
strnlen(lost_found_dir,
PATH_MAX)) == 0) {
PRINT_ERR_MSG(NGMSG_LOST_FOUND);
PRINT_FILE_NAME(argv[i]);
continue;
}
if (mode_flag & STATISTIC) {
file_statistic(argv[i], &buf, FTW_F, NULL);
break;
} else
printf("ext4 defragmentation for %s\n",
argv[i]);
/* Defrag single file process */
file_defrag(argv[i], &buf, FTW_F, NULL);
if (succeed_cnt != 0)
printf(" Success:\t\t\t[1/1]\n");
else
printf(" Success:\t\t\t[0/1]\n");
break;
}
if (succeed_cnt != 0)
success_flag = 1;
if (mode_flag & STATISTIC) {
if (current_uid != ROOT_UID) {
printf(" Done.\n");
continue;
}
if (!succeed_cnt) {
if (mode_flag & DETAIL)
printf("\n");
if (arg_type == DEVNAME)
printf(" In this device(%s), "
"none can be defragmented.\n", argv[i]);
else if (arg_type == DIRNAME)
printf(" In this directory(%s), "
"none can be defragmented.\n", argv[i]);
else
printf(" This file(%s) "
"can't be defragmented.\n", argv[i]);
} else {
float files_ratio = 0.0;
float score = 0.0;
files_ratio = (float)(extents_before_defrag -
extents_after_defrag) *
100 / files_block_count;
score = CALC_SCORE(files_ratio);
printf("\n Total/best extents\t\t\t\t%d/%d\n"
" Fragmentation ratio\t\t\t\t%.2f%%\n"
" Fragmentation score\t\t\t\t%.2f\n",
extents_before_defrag,
extents_after_defrag,
files_ratio, score);
printf(" [0-30 no problem:"
" 31-55 a little bit fragmented:"
" 55- needs defrag]\n");
if (arg_type == DEVNAME)
printf(" This device(%s) ", argv[i]);
else if (arg_type == DIRNAME)
printf(" This directory(%s) ", argv[i]);
else
printf(" This file(%s) ", argv[i]);
if (score > BOUND_SCORE)
printf("needs defragmentation.\n");
else
printf("does not need "
"defragmentation.\n");
}
printf(" Done.\n");
}
}
if (success_flag)
return 0;
exit(1);
out:
printf(MSG_USAGE);
exit(1);
}
--
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